Reflector adjusting mechanism for projection lamps



y 1941- K. BRENKERT 2,242,388

REFLECTOR ADJUSTINGYMECHANISM FOR PROJECTION LAMPS Original Filed July 5, 1938 v 'I'IIIIAKE' V INVENTOR fivn fi/rf/wrg/i r B Y ATTORNEY adjusting the reflector.

Patented May 20, 1941 REFLECTOR ADJUSTING MECHANISM FOR PROJECTIQN LAMPS Karl Brenkert, Detroit, Mich., assignor to Brenkert Light Projection Company, Detroit, Mich, a corporation of Michigan Original application July 5, 1938, Serial No. 217,385. Divided and this application January 21, 1939, Serial No. 252,147

Claims.

This application is a division of my co-pending application Serial No. 217,385 filed July 5, 1938. The invention pertains to improvements in projection lamps of the carbon electrode type.

The principal object of the invention is to provide a more suitable arrangement of the mechanism for adjusting the reflector.

close to the projection booth porthole, which is the most suitable position for him to take while In previous lamps, the operating members are scattered over the housing, requiring the operator to reach and feel for them or to stand away from the porthole, where the illumination in the booth interferes with his vision of the light projected on the screen.

Another novel characteristic of the arrangement herein described is that the reflector adjusting mechanism, except for the operating members, is disposed entirely behind the reflector. In this position, the mechanism is out of the path of the smoke from the arc and leaves a clear space above the arc for ventilation.

The invention is fully disclosed by way of ex- :1; l

ample in the following description and in the accompanying drawing, in which:

Figure l is an elevation, partly in section, of the reflector adjusting mechanism;

Figure 2 is a section'on the line 2-2 of Fig- 1';

ure 1;

Figure 3 is a plan view, partly in section;

Figure 4 is a section on the line 4-4 of Figure 1;

Figure 5 is a detail section, and

Figure 6 is a detail of Figure 2, partly in section.

Reference to these views will now be made by use of like characters that are employed to designate corresponding parts throughout.

In Figures 1, 2, and 4, the numerals 2 and 3 designate respectively the front and rear walls of a projection lamp housing which may be of conventional design or as shown in the above-mentioned co-pending application. The reflector behind the arc of the lamp is mounted in a circular frame Hi having a bracket ll formed on the rear side thereof. To the bracket is pivotally attached, on a horizontal axis, an inverted yoke T2 having an upwardly extending stem 12', as

shown more clearly in Figure 6. On the stem is rotatably mounted a cross member l3 having its ends slidably mounted on a pair of horizontal guide rods M and i4 suitably mounted in the lamp housing and lengthwise thereof. The ends of the member 13 are formed with sleeves or journals l5 and respectively receiving the guide rods as shown more clearly in Figures 2 and 3. To the rear end of one of the journals is fixed a gear box 76 for purpose that will presently be described. To the adjacent journal is secured a plate 1! through which certain adjustments of the reflector are made, as will presently appear. All arm '18 is formed on the yoke 72, extending laterally therefrom to a point slightly in front of the lower :end of plate 11, as shown more clearly in Figures '1 and"2..

Three adjustment rods 19, 86' and "8! are mounted longitudinally in the "top of the lamp housing with their forward ends journaled in the front wall 2 of the housing. The rods 79 and 8! extend into the gear box 16 where they carry long pinions '82 and 83 respectively. The rear end of the rod 80 is formed as a screw 84 threaded 'in the plate ll.

In the forward Wall of the gear box 16 are slidably journaled a pair of stub shafts and 86 carrying pinions 81 and 88 respectively mes ing with the long pinions 82 and 83 respectively. The shaft 85 is threaded at 89 through the plate TI and has its forward end in engagement with a lug 9%] extending upwardly from the top of the frame 10. The shaft 86 is threaded at 9! through the plate 11 and has its forward end in engagement with the outer end of the lateral arm 18.

The rods 19, 89 and Bl are equipped at their forward ends with turning knobs 92 forward of the front wall 2. Turning the rod 19 rotates pinions 82 and 81 and shaft 85 which, while turning, moves axially by reason of its threaded engagement at 89 with the plate Tl. In moving forward, the shaft 85 pushes against the lug and tilts the reflector frame forwardly on the horizontal axis 93 of the yoke 12.

Turning the rod 89 causes the screw 84 to move the plate l? forwardly or rearwardly. Since this plate is fixed to one of the journals 15 of the cross member 13, the latter is moved lengthwise on the guide rods 14, carrying with it the reflector frame for bodily adjustment forward or rearward without tilting. The plate 17 carries along with it the attached journal 15 and gear box 16. This movement is permitted by the clearance of the guide rod M in the journal 15 formed on the gear box.

one of the journals 15 to the frame main- 'I.

tains the members 18 and 90 in contact with the shafts 86 and 85 and determines the position of the reflector frame when these shafts are retractedt It may now be seen that all three necessary adjustments of the reflector are made from operating members located at the front wall of the lamp housing. This arrangement permits the operator to be close to the projection booth porthole in making adjustments. Hitherto, at least one of the adjustment handles has been placed at the rear part of the lamp housing in a position compelling the operator to stand at some distance from the porthole, in which position his vision is affected by the light in the [booth while making an adjustment, with the result that the adjustment is not accurately made.

Another advantage of the construction described herein is that the operating mechanism is behind the reflector where it is not in the path of thesmoke of the arc and does not interfere with the ventilation of the arc.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of theinvention, as indicated by the appended claims.

What I claim is:

1. In a projection apparatus, a housing, guide means mounted lengthwise in said housing, a supporting member slidably mounted on said means, a reflector support pivotallycarried by said member, a reflector frame pivotally carried by said support on an axis perpendicular to the pivotal axis of said support, means for selectively tilting said support and frame on their respective pivotal axes, means for bodily moving said supporting member on said guide means, said tilting means and said moving means being disposed at the rear side of said frame, and operating members extending from said tilting means and said moving means across the periphery of said frame and through the front wall of said housing.

2. In a projection apparatus, a housing, guide means mounted lengthwise in said housing, a supporting member slidably mounted on said means, a reflector support pivotally carried by i said member, a reflector frame pivotally carried by said support on an axis perpendicular to the pivotal axis of said support, lengthwise movable rods for selectively tilting said supportand frame on their respective pivotal axes, pinions on said rods, operating members adjacent to said pinions, elongated pinions on said operating members andmeshing respectively with the first named pinions, and means for bodily moving said supporting member on said guide means.

3. In a projection apparatus, a housing, guide means mounted lengthwise in said housing, a

.- ried by said support, screws threaded through said supporting member and respectively engaging said support and frame laterally of their respective pivotal axes, rotatable operating rods extending through the front wall of said housing and geared to said screws, and means for bodily moving said supporting member on said guide means.

4. In a projection apparatus, a housing, guide means mounted lengthwise in said housing, a supporting member slidably mounted on said means, a reflector support pivotally carried by said member, a reflector frame pivotally carried by said support on an axis perpendicular to the pivotal axis of said support, screws engaging said support and frame for selectively tilting them on their respective pivotal axes, pinions on said screws, operating members adjacent to said pinions, pinions on said operating members and meshing respectively with the first named pinions, all said pinions being disposed behind said frame, and means for bodily moving said supporting member on said guide means.

5. In a projection apparatus, a housing, guide means mounted lengthwise of said housing, a supporting member slidably mounted on said guide means, a reflector support pivotally carried by said member, a reflector frame pivotally carried by said support on an axis perpendicular to the pivotal axis of said support, means for propelling said memberv on said guide and extending through the front wall of said housing, a pair of screws threaded in said member and respectively engaging said support and said frame to turn them on their respective axes, and a pair of rods rotatably mounted in and extending through the front wall of said housing, said rods being geared respectively to said screws for rotating the latter;

KARL BRENKERT. 

